17878-23-8Relevant articles and documents
Photoinduced Electron Transfer in an Anthraquinone-[Ru(bpy)3]2+-Oligotriarylamine-[Ru(bpy)3]2+-Anthraquinone Pentad
Bonn, Annabell G.,Yushchenko, Oleksandr,Vauthey, Eric,Wenger, Oliver S.
, p. 2894 - 2899 (2016)
A molecular pentad comprised of a central multielectron donor and two flanking photosensitizer-acceptor moieties was prepared in order to explore the possibility of accumulating two positive charges at the central donor, using visible light as an energy input. Photoinduced charge accumulation in purely molecular systems without sacrificial reagents is challenging, because of the multitude of energy-wasting reaction pathways that are accessible after excitation with two photons. As expected, the main photoproduct in our pentad is a simple electron-hole pair, and it is tricky to identify the desired two-electron oxidation product on top of the stronger signal resulting from one-electron oxidation.
Molecular assembly of a pyridine functionalized janusarene
Yin, Zhibo,Fan, Luoyi,Lin, Chaojun,Shi, Haonan,Xiong, Bangyuan,Gu, Jiajian,Zhu, Yanpeng,Wang, Jiaobing
, p. 280 - 282 (2022)
We describe a janusarene derivative PyJ, which forms micrometer-scale one-dimensional metallo-supramolecular polymer through coordination driven self-assembly. PyJ is a well-preorganized dodecatopic pyridyl ligand built on a hexaphenylbenzene platform. The two-face structural feature of PyJ allows for a delicate control over multiple Py-Ag+-Py coordination interactions, leading to assembled structure of PyJ-Ag+, which was characterized by dynamic light scattering, atomic force microscopy, and transmission electron microscopy.
Synthesis of a Contrapositionally Substituted Cyclohexa- meta -phenylene: A Ready-to-Use Precursor for Cyclohexa- meta -phenylene-Based Materials
Arshad, Ifzan,Channar, Pervaiz Ali,Irfan, Rana Muhammad,Saeed, Aamer,Shehzadi, Syeda Aaliya
supporting information, p. 1886 - 1890 (2019/09/30)
A contrapositionally substituted derivative of cyclohexa- meta -phenylene ([6]CMP) was synthesized by an intramolecular Yamamoto coupling reaction of an appropriate terphenyl unit containing a trimethylsilyl substituent. Iododesilylation of the trimethyls
The silicon-containing compound having a substituent, and containing the therapeutic agent and canceration singlet oxygen generator
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Paragraph 0025, (2016/10/17)
A compound represented by any of general formulae (I) to (IV) is to be used as the active ingredient of a singlet oxygen-generating agent. In each of R1 to R20 in general formula (I), R1 to R24 in general formula (II), R1 to R28 in general formula (III) a
This high efficiency polycarbazole compound and an organic electroluminescence element including (by machine translation)
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Paragraph 0056, (2016/11/17)
The present invention relates to a highly efficient carbazole-based compound and to an organic electroluminescence device including the same. According to the present invention, provided are a compound for an organic electroluminescence device and an organic electroluminescence device including the compound, in which a carbazole-based phosphine oxide compound, which is a compound intended for an organic electroluminescence device, is employed to overcome the problems of conventional compounds for organic electroluminescence devices, i.e. those of instable thermal stability and low efficiency, and particularly, the compound of the present invention exhibits superior efficiency in pure-blue phosphorescent devices.
Silylation improves the photodynamic activity of tetraphenylporphyrin derivatives in vitro and in vivo
Horiuchi, Hiroaki,Hosaka, Masahiro,Mashio, Hiroyuki,Terata, Motoki,Ishida, Shintaro,Kyushin, Soichiro,Okutsu, Tetsuo,Takeuchi, Toshiyuki,Hiratsuka, Hiroshi
supporting information, p. 6054 - 6060 (2014/05/20)
The effects of silyl and hydrophilic groups on the photodynamic properties of tetraphenylporphyrin (TPP) derivatives have been studied in vitro and in vivo. Silylation led to an improvement in the quantum yield of singlet oxygen sensitization for both sulfo and carboxy derivatives, although the silylation did not affect other photophysical properties. Silylation also improved the cellular uptake efficiency for both sulfo and carboxy derivatives, enhancing the in vitro photodynamic activity of the photosensitizer in U251 human glioma cells. The carboxy derivative (SiTPPC4) was found to show higher cellular uptake efficiency and in vitro photodynamic activity than the corresponding sulfo derivative (SiTPPS4), which indicates that the carboxy group is a more promising hydrophilic group than the sulfo group in the silylated porphyrin. SiTPPC4 was found to show high selective accumulation efficiency in tumors, although almost no tumor selectivity was observed for the nonsilylated porphyrin. The concentration of SiTPPC4 in tumors was 13 times higher than that in muscle 12 h after drug administration. We also studied tumor response after treatment and found that silylation enhanced in vivo photodynamic activity significantly. SiTPPC 4 shows higher photodynamic activity than NPe6 with white light irradiation. Improved photosensitizers: Silylation improves the quantum yield of singlet oxygen sensitization, cellular uptake efficiency, and selective accumulation efficiency in tumors. As a result of these improvements, silylation significantly enhances photodynamic activity (see figure). The results of this work suggest that silylation is a promising strategy for improving photosensitizers for photodynamic therapy.
Iridium-catalyzed oxidative olefination of furans with unactivated alkenes
Sevov, Christo S.,Hartwig, John F.
supporting information, p. 10625 - 10631 (2014/08/18)
The oxidative coupling of arenes and alkenes is an attractive strategy for the synthesis of vinylarenes, but reactions with unactivated alkenes have typically occurred in low yield. We report an Ir-catalyzed oxidative coupling of furans with unactivated olefins to generate branched vinylfuran products in high yields and with high selectivities with a second alkene as the hydrogen acceptor. Detailed mechanistic experiments revealed catalyst decomposition pathways that were alleviated by the judicious selection of reaction conditions and application of new ligands.
Asymmetric bromine-lithium exchange: Application toward the synthesis of natural product
Graff, Julien,Debande, Thibaut,Praz, Jezabel,Guenee, Laure,Alexakis, Alexandre
supporting information, p. 4270 - 4273 (2013/09/12)
Asymmetric bromine-lithium exchange has been successfully employed to synthesize bicoumarin chiral building blocks of (+)-isokotanin A and (-)-kotanin in good yields and with an excellent level of enantioselectivity. This is the first reported example of formal syntheses, using this direct methodology, leading to the single (M)-atropoisomer of (+)-isokotanin A and (-)-kotanin building blocks, without any resolution step.
HIGHLY EFFICIENT CARBAZOLE-BASED COMPOUND, AND ORGANIC ELECTROLUMINESCENCE DEVICE COMPRISING SAME
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Page/Page column, (2013/05/22)
The present invention relates to a highly efficient carbazole-based compound and to an organic electroluminescence device including the same. According to the present invention, provided are a compound for an organic electroluminescence device and an organic electroluminescence device including the compound, in which a carbazole-based phosphine oxide compound, which is a compound intended for an organic electroluminescence device, is employed to overcome the problems of conventional compounds for organic electroluminescence devices, i.e. those of instable thermal stability and low efficiency, and particularly, the compound of the present invention exhibits superior efficiency in pure-blue phosphorescent devices.